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Marketable Securities (Tables)
 9 Months Ended
Jun. 30, 2013
Marketable Securities [Abstract]  
Schedule of Marketable Securities
At June 30, 2013 our marketable securities were (in thousands):
 
Amortized
Cost (1)
 
Unrealized
Gains
 
Unrealized
Losses (2)
 
Fair Value (1)
Current marketable securities:
 
 
 
 
 
 
 
Corporate bonds
$
34,163

 
$
6

 
$
(47
)
 
$
34,122

Certificates of deposit
3,004

 
—

 
(3
)
 
3,001

Government municipal bonds
7,682

 
2

 
(1
)
 
7,683

Current marketable securities
44,849

 
8

 
(51
)
 
44,806

Non-current marketable securities:
 
 
 
 
 
 
 
Corporate bonds
2,030

 
—

 
(5
)
 
2,025

Certificates of deposit
8,002

 
—

 
(34
)
 
7,968

Government municipal bonds
3,117

 
—

 
(2
)
 
3,115

Non-current marketable securities
13,149

 
—

 
(41
)
 
13,108

Total marketable securities
$
57,998

 
$
8

 
$
(92
)
 
$
57,914

(1)
Included in amortized cost and fair value is purchased and accrued interest of $388.
(2)
The aggregate related fair value of securities with unrealized losses as of June 30, 2013 was $47,140. These investments have been in an unrealized loss position for less than twelve months.
5. MARKETABLE SECURITIES (CONTINUED)
At September 30, 2012 our marketable securities were (in thousands):
 
Amortized
Cost (1)
 
Unrealized
Gains
 
Unrealized
Losses (2)
 
Fair Value (1)
Current marketable securities:
 
 
 
 
 
 
 
Corporate bonds
$
39,306

 
$
14

 
$
(19
)
 
$
39,301

Commercial paper
2,000

 
—

 
—

 
2,000

Certificates of deposit
7,262

 
—

 
(4
)
 
7,258

Government municipal bonds
9,814

 
1

 
(2
)
 
9,813

Current marketable securities
58,382

 
15

 
(25
)
 
58,372

Non-current marketable securities:
 
 
 
 
 
 
 
Corporate bonds
2,019

 
—

 
(3
)
 
2,016

Total marketable securities
$
60,401

 
$
15

 
$
(28
)
 
$
60,388

(1)
Included in amortized cost and fair value is purchased and accrued interest of $485.
(2)
The aggregate related fair value of securities with unrealized losses as of September 30, 2012 was $34,503. These investments have been in an unrealized loss position for less than twelve months.